A shaped scheme based on geometric optics for offset fed dual reflector antenna is presented. A ray tube emerging from a symmetric feed horn is transformed, after reflections, into a circular beam with a uniform phased and a prescribed radial power distribution on the aperture. Snell’s law was imposed on the subreflector. Based on this design solution, theoretical analysis, numerical simulation and experimental test were carried out for a 110 cm dish baseline system with a angle of 20 degrees between X axis and the beam. The experiment shows that at 95 GHz, the antenna has a 78% aperture efficiency and the minor lobe meets a -19 dB criterion and the gain is 59.7dB.